Where have the birds gone?

We live on the edge of a small village surrounded by countryside. There a quite a few trees around our house. We have a wildlife/woodland themed rear garden where we have a well-stocked bird table. Doves have taken over the garden, we reckon up to a dozen live around us, one pair nesting in one of our trees. We used to watch the doves lining up on our summer house taking it in turns to feed.
During the cold weather the bird able was well attended until about two days before the very cold weather ended. Since then attendance has been well down judging by how slowly the food has disappeared. This happened once before, at the end of one August a few years ago. Presumably there was plenty to eat lying around then which there isn’t now.
Anyone any ideas what has happened.
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They're often finding food elsewhere, especially in mild spells etc. Insect eaters in particular. They can also be looking for a partner at this time of year, or potential nesting sites.
I live in west central Scotland - not where that photo is...
Word has got out that I have begun feeding again. My usual flock of long-tailed tits were back on the feeding station this morning, lovely to watch them all. I wish they would sit in a row to give me time to count them They flit back and forth constantly, then suddenly all disappear.